Table 2.

Effects of sleep duration on incidence of cancer

Characteristic	N	Event N	Mod1			Mod2			Mod3
			HR1	95% CI1	p-value	HR1	95% CI1	p-value	HR1	95% CI1	p-value
Overall cancer
Nocturnal sleep duration (hours)	9,996	325
6-9	4,827	141	—	—		—	—		—	—
<6	4,761	168	1.18	0.94, 1.47	0.155	1.11	0.89, 1.39	0.360	1.13	0.90, 1.42	0.282
>9	408	16	1.34	0.80, 2.24	0.269	1.29	0.77, 2.17	0.336	1.28	0.76, 2.16	0.345
Day time sleep duration(minutes)	9,996	325
≤30	6,424	196	—	—		—	—		—	—
>30	3,572	129	1.19	0.95, 1.48	0.130	1.15	0.92, 1.44	0.225	1.13	0.90, 1.41	0.295
Total sleep duration(hours)	9,996	325
6-9	5,420	153	—	—		—	—		—	—
<6	3,557	131	1.31	1.04, 1.65	0.023	1.26	0.99, 1.59	0.059	1.27	1.01, 1.61	0.046
>9	1,019	41	1.44	1.02, 2.03	0.039	1.40	0.99, 1.98	0.054	1.39	0.98, 1.96	0.063
Digestive&Respiratory_System
Nocturnal sleep duration (hours)	9,996	184
6-9	4,761	79	—	—		—	—		—	—
<6	4,827	97	1.21	0.90, 1.63	0.206	1.14	0.84, 1.53	0.40	1.12	0.83, 1.51	0.457
>9	408	8	1.18	0.57, 2.45	0.648	1.04	0.50, 2.16	0.913	1.04	0.50, 2.17	0.909
Day time sleep duration(minutes)	9,996	184
≤30	6,424	110	—	—		—	—		—	—
>30	3,572	74	1.21	0.90, 1.63	0.204	1.04	0.78, 1.41	0.773	1.09	0.81, 1.48	0.558
Total sleep duration(hours)	9,996	184
6-9	5,420	82	—	—		—	—		—	—
<6	3,557	79	1.47	1.08, 2.01	0.014	1.43	1.05, 1.95	0.025	1.41	1.03, 1.93	0.032
>9	1,019	23	1.50	0.94, 2.38	0.086	1.36	0.86, 2.17	0.193	1.36	0.85, 2.16	0.199
Other System
Nocturnal sleep duration (hours)	9,996	140
6-9	4,761	64	—	—		—	—		—	—
<6	4,827	68	1.05	0.75, 1.48	0.785	1.00	0.71, 1.41	0.986	1.05	0.74, 1.48	0.782
>9	408	8	1.46	0.70, 3.05	0.312	1.51	0.72, 3.16	0.274	1.45	0.69, 3.03	0.325
Day time sleep duration(minutes)	9,996	140
≤30	6,424	85	—	—		—	—		—	—
>30	3,572	55	1.16	0.83, 1.63	0.379	1.28	0.91, 1.80	0.161	1.18	0.84, 1.67	0.345
Total sleep duration(hours)	9,996	140
6-9	5,420	73	—	—		—	—		—	—
<6	3,557	49	1.02	0.71, 1.47	0.898	0.96	0.67, 1.39	0.838	0.98	0.68, 1.42	0.927
>9	1,019	18	1.31	0.78, 2.20	0.303	1.36	0.81, 2.29	0.241	1.32	0.78, 2.21	0.299